There is no time difference between Dallas and Chicago. Both cities use Central Time (CST, UTC-6 in winter and CDT, UTC-5 in summer). When it's 9:00 AM in Dallas, it's also 9:00 AM in Chicago.
Both cities observe daylight saving time on the same schedule, so they remain synchronized year-round.
Any time works! Since both cities share the same timezone, you can schedule calls during standard business hours (9:00 AM - 5:00 PM) without any time conversion needed.
Dallas and Chicago are major American business centers connected by frequent direct flights taking about 2.5 hours. Both are major hubs for American Airlines and United Airlines respectively.